I doubt there is any limit number given from VMware on this & this might not have been tested as well.
But it is highly recommended to limit # of identity sources to the absolute minimum required to administer the vCenter
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Thanks & Regards
Vikas, VCP70, MCTS on AD, SCJP6.0, VCF, vSphere with Tanzu specialist.
https://vThinkBeyondVM.com/about
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